Her Gun, His Rules

Rosalind was given the choice from a young age, whether she would be a spoiled, pampered mafia princess, or whether she would fight to stand alongside of her brothers. Four older brothers to be precise. Rosalind chose the latter, after twenty years of training and fighting she and the other apprentices will finally be allowed to enter the mafia with a code name of her father's choosing.
They will also be given their first assignment, but after Rosalind gets her assignment she crosses path with the eldest son of a rival mafia boss. A man she is meant to kill. However, this assignment requires she get close to him in ways she's never allowed herself to before. And soon, Rosalind will earn the name princess, but only, when the name crosses his lips.